just mess around with it alot and you will get there trust me
You need the 2 passwords one is told from a rocket at Mt Ember and the second is told by a scientist in dotted hole that steals the sapphire from you.
On cinnabar Island, to the left of the pokemon center, lies a "laboratory". If you go inside, then go to the right and enter the third door. Talk to the Professor there.
after this occurs he will give you a password go to five island and enter the rocket warehouse which is to the right of the Pokemon center. After going through the warehouse defeat the guy who stole the sapphire and he will give it to you.
you need a gameshark or a action replay, and if you use these, you might not be able to trade, transfer, or battle with other games
I believe it's just a museum of fossil of very rare legendary pokemons. It costs 50 to enter, in Pewter City. That's the only one that comes to mind, so I hope it's the right one.
If you insert Pokemon LeafGreen into the GameBoy Advance Game Slot on your Nintendo DS before playing Pokemon Pearl, Vulpix will appear on Route 209 in Pokemon Pearl. Or, you can catch it in Ruby - Route 122 - Mt. Pyre. Fly to Lilycove and just surf to Mt.Pyre, enter and go up until you reach the outside. There its grass where Vulpix is. Its not very rare, take 10min looking for it and youll get one. THEN you migrate it to Pearl/diamond. If you don't know how to migrate, just search for "how to migrate Pokemon pearl" on Google youll find answer easy. Hope I helped. In LeafGreen you can find it in the Pokemon Mansion on cinnabar island.
with a gameshark only
Go to lavendar town and then enter Pokemon tower in there you can find a gastly.
You need a game shark
Trade it from from Firered or Leafgreen. Or get a gameshark and enter the CORRECT code.
On cinnabar Island, to the left of the pokemon center, lies a "laboratory". If you go inside, then go to the right and enter the third door. Talk to the Professor there.
http://www.gamefaqs.com/gba/918916-pokemon-leafgreen-version/faqs/46239 This is a link to a walk through. Credit goes to Deathborn668 as he is known on the message boards. Press Ctrl+F, and enter in this... "Oh, grand. The stupid arrow pads are back. That's expected I suppose." which will zoom you straight to the section on which he covers the Rocket Warehouse, full detail. Hope I helped. ^Enter that in the Ctrl+F search box.
You can't capture teddiursa in leafgreen but in emerald you can in a special johto area of the safari zone after beating the Pokemon league you can enter this area. Also trade the purified teddiursa from Pokemon xd gale of darkness to leafgreen or get the purified ursaring from Pokemon colosseum then breed it in leafgreen to get teddiursa.
The Secret Key that you get in the Pokemon Mansion is used to enter the Cinnabar Gym.
In the Team rocket werehouse on five island. I forget but I think you need to fight some rocket grunts before you can get to it.The upgrade can be found in the Team Rocket Warehouse in the Sevii Islands. You will need 2 passwords to enter, and it is found amidst other items in the floor panel puzzle that covers the majority of the warehouse.
Beat the elite 4 and champion, then the man will stand aside and let you enter.
if your in celidon then head west to the cycling road then enter the east part and your in fuchsia
Go to four island and enter icefall cave HM7 is in there and its waterfall.